/*
 * Copyright (c) 2011 Junichiro Okuno
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied, of Junichiro Okuno.
 */

package tcp_net.management.commands;

import tcp_net.TextInputOutput;
import tcp_net.management.commands.debug.DebugInfo;
import java.util.List;

/**
	This class provides a defined command to be executed
	@author J. Okuno
*/
public class ModifyDNS extends UserCommand
{
	/**
		A file path to store a list of local domain names
	*/
	private final static String DOMAIN_LIST = "conf/domain_list.txt";
	
	/**
		An old local domain name
	*/
	private String old_domain;
	
	/**
		A new local domain name
	*/
	private String new_domain;
	
	/**
		Init the class
		@param old_dom an old domain name
		@param new_dom a new domain name
	*/
	public ModifyDNS(String old_dom, String new_dom) 
	{
		old_domain = old_dom;
		new_domain = new_dom;
	}
	
	/**
		This method executes a defined command
		@return a list of reply messages in a string format
	*/
	public List<String> execute() 
	{ 	
		//Remove the old domain from the list 
		List<String> domain_list = TextInputOutput.getTextAsList(DOMAIN_LIST);
		if(domain_list.remove(old_domain))
		{	
			TextInputOutput.setText(DOMAIN_LIST , domain_list);
		}
		else
		{
			return createReply("Domain NOT registered"); 
		}
		
		//Add the new domain to the list (Only if the old domain is in the list)		
		for(String d : domain_list) 
		{ 
			if(d.equals(new_domain)) { return createReply("Domain already registered");  }
		}
		
		domain_list.add(new_domain);
		
		TextInputOutput.setText(DOMAIN_LIST , domain_list);
		return createReply("Domain changed"); 
	}
}